Cement composition and method of producing



' Patented Oct. 14, 1947 Examine UNITED STATES PATENT OFFICE CEDIENT COMPOSITION AND METHOD OF PRODUCING Lewis H. Colvin, Indianapolis, Ind., assignor to Wayne B. Colvin and Glenn Colvin, both of New York, N. Y.

. No Drawing. Application August 19, 1944,

Serial No. 550,319

9 Claims.

1 The object of my invention is to provide a novel composition of matter which, when mixed with water and brush-applied to surfaces of Portland cement concrete or other similar sur- 2 I then locally apply the tip of a blow torch flame until the mixture takes fire locally, where upon the blow torch flame should be withdrawn, combustion propagating in the mixture until it faces, will seal such surfaces against the passage 5 turns black. Local application of flame. as deof water in either direction.

My invention resides in the new composition of matter and in the method of producing it.

scribed above, may be omitted if the whole mass is crucible heated until it turns black but this requires a greater expenditure of heat. However, my experience indicates that initial heating to To one part, by volume, of ehromic F crystals, such as are commonly use e co rolytic yellow heat must be accomplished slowly, in order b'a'ths for chrome plating, I add 1% to 2 /2 parts, by volume, of umicite of the character of coma T'n 5imercially obt a e pumicite found the a s e of such pumicite shows to avoid explosion, and that heating beyond the yellow heat must be more rapid to obtain proper unification of the ingredients. For that reason, the method of local ignition at the yellow stage is 5 5 recommended. For instance, I have obtained the following ingredients and characteristics: successful results by applying heat to about one Per cent teaspoonful of such a mixture of mixture A and aluminum at such rate that the yellow stage was gfl g (volame at 212 degrees None reached in from 15 to minutes, whereas if 90 heat were applied at such rate to such an amount f ga if g gz g ferric oxide (Fezoa) as to raise it to the yellow stage in 5 minutes, ex- Titanium oxide 0.12 g gf i his d m m b Calcium oxide L80 om us on n t mixture pro uces a g y Magnsmm oxide 0 21 yellow glow until the mixture finally turns black. Potassium oxide 25 This resid e, while still hot, is quite friable and sodium oxide is wound to mgr-conveniently about Carbon dioxide "E55 foimd 20M ence, the above powder Sulphur trioxide None found Wm f f z t 2 1b 1 m n Chlorine u s. o s. s mec a ca y Loss on ignition 94 lbs. to produce a m r 2- r eae ixtureC When sumcient we r is added %0 mixture 8 a brushable paste is pro uced which, w en app d to surfaces of Portland cement concrete, quickly hardens, with a glossy surface and forms a highly elficient seal against the passage of water to or from the body of the concrete.

The surface of the concrete should be preliminarily thoroughly dampened in order to obheated sulphur is given off during this heating 40 tain the best results.

operation and heating should be continued until production of this odor ceases. My experience also indicates the necessity of use of a nonmetallic crucible for this heating operation in order to avoid explosion.

While hot, the above residue is readily friable and is reground to a fine powder. Regrinding when c e accomp iid'but is much more dimcult. For convenience this e ound mixture will be hereafter referred to as mixture K To mixture A (2.5 to 3.5 volumes 1 to 2 commonly used in produc g a uminum paint. After thorough mixing (A and aluminum), I ,heat

vidua 4 d and then but Hive M ine presence" "of fpfim'icite with. 1 di appears to facilitate the epowder. The presence of the umici with the chromic old and aluminum 3 grinding in- ElBits' explosions.

If the chromic acid and pumiclte are not heated together the final mixture C will not set.

I have found it advisable to aply the blow slowly in a non-metallic crucible to a yellow heat torch flame upon gigg latigely 1 r soe 'r ea s'o'n not known to me, some fiumi$ (such, for instance, as those orlgnatin no em Nebrggg) are not ava a e or my pr uc as e end results a o 1. A composition of matter comprising the residue of a mixture of chromic acid and pumicite having the characteristics of that ori inatidg near Meade, Kansas, and described in the above specification, heated until black.

2. A composition of matter comprising the residue of a mixture of chromic acid and pumicite having the characteristics of that originating near Meade, Kansas, and described in the above specification, in the approximate proportions of 1 vol. chromic acid, 1% to 2% vol. pumicite heated until black.

3. A composition of matter comprising the residue of a, mixture of chromic acid and pumicite having the characteristics of that originating near Meade, Kansas, and described in the above specification, heated until black and ground to a fine powder.

4. A composition of matter comprising the residue of a mixture of chromic acid and pumicite having the characteristics of that originating near Meade, Kansas, and described in the above speciflcation, in the approximate proportions of 1 vol. chromic acid, 1 to 2 vol. pumicite heated until black and ground to a fine powder.

5. A composition of matter comprising a powder formed of the residue of chromic acid and pumicite having the characteristics of that originating near Meade, Kansas, and described in the above specification, in the approximate proportions of 1 vol. chromic acid, 1% to 2% vol. pumicite heated until black (mixture A), and metallic aluminum in the proportions 2 /2 to 3 vol. mixture A, 1 to 2 vol. aluminum, heated together until black.

6. A composition of matter comprising a mixture of the composition of claim 5 and Portland cement in the approximate portions /8 to 2 lbs. mixture B, 94 lbs. Portland cement.

7. The method of producing a water proofing composition which involves the step of heating together in a non-metallic container, a mixture of chromic acid and pumicite having the characteristics of that originating near Meade, Kansas, and described in the above specification, until 4 black, the step of reducing said black mixture to powder, the step of mixing said powder with finely divided aluminum, and the step of reducing said last-named mixture by heat to a black residue.

8. The method of producing a water proofing composition which involves the step of heating together in a non-metallic container, 9. mixture of chromic acid and pumicite having the characteristics of that originating near Meade, Kansas, and described in the above specification, until black, the step of reducing the black residue to powder, the step of mixing said powder with finely divided aluminum in the approximate proportions 2% to 3 vol. black powder, 1 to 2 vols. aluminum, and the step of reducing said last-named mixture by heat to a black residue.

9. The method of producing a water proofing composition which involves the step of heating together in a non-metallic container, 9. mixture of chromic acid and pumicite having the characteristics of that originating near Meade, Kansas, and described in the above specification, until black, the step of reducing the black residue to powder, the step of mixing said powder with finely divided aluminum in the approximate proportions 2 /2 to 3 vol. black powder, 1 to 2 vols. aluminum, the step of reducing said last-named mixture by heat to a black residue, the step of reducing the last-named black residue to powder, the step of mixing said last-named powder with Portland cement in the approximate proportions pound to 2 pounds powder, 94 pounds cement, and the step of mixing water with said last-named mixture to produce a brushable .paste.

LEWIS H. COLVIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,782,460 Carlson Nov. 25, 1930 2,061,972 Reed-Lewis Nov. 24, 1936 1,800,024 Marczinczek Apr. 7, 1931 1,944,820 Beghelli Jan. 23, 1934 1,951,186 DeBow Mar. 13, 1934 FOREIGN PATENTS Number Country Date 306,444 Great Britain 1929 

